Record Medium, Optical Disk Unit Using It, and Recording Method
AssigneePanasonic Corporation
InventorsShohei Inoue, Hideaki Horio, Taiichi Mori, Tetsuya Araki, Kouichi Bairin
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Abstract
To accomplish the object, the invention provides a record medium including a plate body 2; multiple hologram layers 3 formed in the thickness direction of the plate body 2; and hologram bands 4 formed in at least one of the multiple hologram layers 3. The hologram band 4 is formed with erasure areas 4A and 4B of the hologram band 4 with no hologram band 4 in the direction orthogonal to the length direction of the hologram band 4.
Claims12
A record medium, comprising:
- a plate body;
- multiple hologram layers formed in a thickness direction of the plate body;
- and
- a hologram band formed in at least one of the multiple hologram layers;
- wherein the hologram band is formed with a hologram band erasure area having no hologram band in a direction orthogonal to the length direction of the hologram band.
A record medium recording method an a record medium comprising a plate body, multiple hologram layers formed in a thickness direction of the plate body;
- and a hologram band formed in at least one of the multiple hologram layers, the method comprising:
- forming an erasure area of the hologram band by applying circular light having a larger diameter than a width in a direction orthogonal to the length direction of the hologram band.
A record medium comprising:
- a plate body;
- multiple hologram layers formed in a thickness direction of the plate body;
- and
- a hologram band formed in at least one of the multiple hologram layers, wherein the hologram band is formed with an alternating pattern of an erasure area and a non-erasure area.
Dependencies are inferred from the claim text.